Expansion barrel nut for a firearm



FIG. 1 is a perspective view of an expansion barrel nut for a firearm according to an embodiment of the disclosure;

FIG. 2 is a perspective view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a cross-sectional view thereof along line 4-4 of FIG. 3;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof. 

CLAIM The ornamental design for an expansion barrel nut for a firearm, as shown and described. 